An 8-digit identification number is stamped on the fuel rail. Refer to this number if servicing or part replacement is required.

CAUTION

In order to reduce the risk of fire and personal injury that may result from a fuel leak, always install the fuel injector O-rings in the proper position. If the upper and lower O-rings are different colors (black and brown), be sure to install the black O-ring in the upper position and the brown O-ring in the lower position on the fuel injector. The O-rings are the same size but are made of different materials.

Remove and discard the O-rings from the spray tip end of each injector.

WARNING

Use care in removing the fuel injectors in order to prevent damage to the fuel injector electrical connector pins or the fuel injector nozzles. Do not immerse the fuel injector in any type of cleaner. The fuel injector is an electrical component and may be damaged by this cleaning method.

Fig. Fuel injector

Remove the fuel injector retaining clip, if required.

Remove the fuel injector from the fuel rail, if required.

Remove and discard the fuel injector upper O-ring.

To install:

NOTE

DO NOT reuse the fuel injector O-ring seals. Install new O-ring seals during assembly.

Lubricate the new injector O-rings with clean engine oil.

Install the new fuel injector upper O-ring.

Install the fuel injector to the fuel rail, if required.

Install the fuel injector retaining clip, if required.

Lubricate the new lower injector O-rings with clean engine oil.

Install the fuel rail assembly into the intake manifold. Tilt the fuel rail assembly slightly to install the injectors.

Fig. Fuel rail installation 3.9L engine

Install the fuel rail bolts and tighten to 89 inch. lbs. (10 Nm).

Connect the CMP sensor electrical connector.

Position the fuel injector harness connector bracket to the intake manifold.